(i) Alveoli are tiny air sacs in lungs where exchange of gases occurs. Oxygen diffuses into blood, and carbon dioxide diffuses out.(ii) Stomata are small pores on leaves that allow exchange of gases and water vapour. CBSE Sample Paper Class ...
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Plants excrete wastes in several ways. Excess water is lost through transpiration. Oxygen from photosynthesis diffuses out through stomata. Some wastes like gums, resins, and latex are stored in old xylem or special cells. Leaves and bark shedding also remove ...
During photosynthesis, plants release a large amount of oxygen as a by-product while absorbing carbon dioxide. The oxygen produced is much more than what plants use for respiration, so the atmosphere never faces oxygen shortage. CBSE Sample Paper Class 10 Science ...
The correct answer is [C] A is true but R is false.The maximum concentration of chemicals and pesticides occurs at the highest trophic level, not the first. These chemicals are non-biodegradable, so they accumulate through the food chain, causing ...
The correct answer is [A] Both A and R are true, and R is the correct explanation of A.The father contributes either an X or Y chromosome. If the child inherits X from father, it becomes XX (girl), and ...